Electrically-heated device



Sept. 15, 1925. 1,553,422

J. C. WOODSON ELECTRI CALLY HEATED DEVICE Filed May 26,, 1923 Fly, 2.

WITN s /7 INVENTOR jamea C. 14 000 500 /7 ATTORN EY Patented Sept. 15, 1925.,

53,422 UNITED STATES PATIENT OFF-ICE.

JAMES C. WOODSON, OF EAST PTTTSIBURGH, PENNSYLVANIA, ASSIGNOR TO WESTING:

HOUSE ELECTRIC VANIA.

EnncrnIoALLY-nmrn'n nnvron Application filed May 26, 1923. Serial No. 641,563. I

To all whom it may concern:

Be it known that I, JAMES C. WoonsoN, a citizen of the United States, and a resident of East Pittsburgh, in-the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Electrically-Heated Devices, of which the following is a specification. I

My invention relates to electrically heated devices and particularly to heating elements.

therefor.

The object of my invention is to provide a relatively simple, compact and easily manufactured electric heating element that may be operatively associated with the roll of an ironing machine.

-In practicing my invention, I provide a flat, extended bar of electric-insulating material andsecure against one face thereof one or more extended electric heating elements. A second bar' of refractory electricinsulating material is located closelyadja cent to the other face of the bar, the two bars being co-extensive.

A metal member, of overhanging channel section, is provided to hold the two bars in their proper operative positions relatively to each other. Two of the above described heating elements are secured in opposite andv coextensive relation relatively to-each other on a tubular supporting member of relatively small diameter. The assembled heating elements and the tubular supporting member are located within an ironing roll that is rotatably mounted in suitable bearthrough the, tubular supporting member and out at one end thereof.

In-the single sheet of drawings, Figure 1 is a view, in front elevation, of an ironingroll comprising the device emroll being cut away to show the interior construction thereof, A

Fig. 2 is a view, in lateral section therethrough, taken on the line 11-11 of Fig. 1, Fig. 3 is a top plan View of an electric heating element embodying my invention,

Fig. 4 is a view, in side elevation, of the device embodying my invention, and

Fig. 5 is a schematic diagram of connections employed therewith.

. A roll for an ironing machine or mangle the plate 16 and be' .the rear surface of bodying my invention, certain parts of the comprises a tubular member 11 that may be made of any suitable metal and may have its outer surface highly polished. Ateach end of the tubular member 11 there is provideda flanged metal member 12, the outer peripheral flangeof which operatively engages the inner surface of the tubular member 11 and the inner flange-portion 13of which is suitably mounted in a bearing member (not shown) to permit of rotating the drum 11 and the two end members 12. Any suitable or desired method of securing the members 12 to the tubular member 11 may be employed.

A substantially stationary heating element supporting structure for the roll 11 comprises an elongated metal tubular member & MANUFACTURING COMPANY, A CO'RPORATTON OF PENNSYL- 14 that extends through an opening 15 in 4 each of the end members 12. The clearance provided between the outside of the member 14 and the inside of the flange portion 13 constituted by the opening 15, is relatively large in order that a certain amount of misalinement may be taken care of. I

plurality of heating elements are mounted on the tubular member 14 and severally comprise a relatively narrow and elongated bar 16,,of a suitable refractory electric-insulating material, such as asbestos held against the outer surface of the plate ings. A plurality of terminal leads extend v is the plate 16 or it may be made of a refractory material having greater heat-insulating qualities to reduce the amount of heat that is permitted to flow through the plate 16. A metal member 22, of substantially overhanging channel section, is provided for the two bars 16 and 21 which are located therein and held in their proper operative resistor member 17,

suitable openings 19in overhanging flange portions 23 of both the side and the end portions of the member 22.

Suitable terminal members for the heating units 17 may comprise machine screws 2 1 and co-operating nuts 25, the screws extending through only the outer plate 16. By this construction, the inner plate serves not only as a heat-insulating means but, also, has an electric-insulating means against the supporting loops 18 andthe terminal members 24:.

Two of the hereinbefore described heating elements are mounted in back-to-back and coextensive positions on the tubular member -11 by a plurality of machine bolts 26 and co-operating' nuts 27. The bolts 26 extend through elongated openings 28 in the tubular member 14 in order that the heating elements may be free to expand and contract under the ordinary conditions of operation which. require repeated heating and cooling thereof.

A plurality of terminal leads 29 are provided for the resistor dnembers or heating units 17 which may be connected substantially as illustrated 1n Fig. 5 of the drawing. As illustrated therein, three terminal leads 29 are provided, and if each of the heating elements 17 is designed to be energized from a 110 volt circuit, it is only necessary to connect the two outer leads 29 together and to one supply circuit conductor and the intermediate lead 29 (to the other supply circuit conductor to permit of energizing the entire set from a 110 volt circuit.

If it is desired to energize the heating elements from 220 volt circuit, the supply circuit conductors will be'connected to the two outer terminal leads only. The leads 29 extend through a perforated terminal member 31 that is secured against the tubular member 14 adjacent to one end of the roll 11, substantially as illustrated in Fig.

. 1 of the drawin the inner ends of the leads 29 being suitab y connected to the terminal members 24, by an additional nut 25 mounted thereon.

The dimensions of the plates 16 and 21 laterally thereof and the location of the heating units 17 mounted thereon are so selected that the heating units 17 are distributed substantially uniformly circumferen-tially of thetubular member 11. The

. heating units 17 are operated at relatively high vtemperatures and the heat will be given off to the inner surface of the roll 11, mainly by radiation, and by locating the heating-units 17 uniformly circumferentially of the roll a substantially uniform degree of heat of the roll around the periphery is maintained during the operation thereof.

The device embodying my invention permits of'easy and quick assembly and disassembly of the resistors on the refractory supporting plates and of the assembled aaeaeao heating elements on the tubular supporting means and also its quick assembly in, disassembly from, the roll whenever required.

Various modifications and changes may be made herein without departing from the spirit and scope of the invention, and such modifications are intended to be covered by the appended claims.

I claim as my invention:

1. In an electrically heated device, in combination, a heating element comprising a relatively shallow and elongated metal member, of substantially channel section, a bar of refractory electric-insulating material, an extended resistor member secured against the outer surface thereof, a second bar of refractory electrioinsulating -material located closely adjacent to the rear surface of the first bar, both said bars being located in said member of channel section and held therein by means integral with the side flanges thereof.

. 2. In an electrically heated device, in combination, a heating element comprising an elongated bar of refractory electric-insulating material, a plurality of extended electric heating units supported on one face thereof in parallel-spaced relation, a second bar of refractory electric-insulating material co-extensivewith said first bar and located against the other face thereof, and a single metal member, of substantially overhung channel section for holding the two bars in proper operative positions relatively to each other. 1

3. In an electrically heated device, in com- 'bination, a rotatably mounted tubular memher, a stationary heating element-supporting means extending into and through said tubular member, and a plurality of electric heating elements substantially co-extensive with said tubular member mounted on said supporting means and in heat-radiating relation to. the inner surface of the rotatable tubular member.

4. In an electrically heated device, in combination, a rotatably mounted tubular member to be heated, a stationary supportingmeans extending through said tubular member and coaxial therewith, a plurality of heating element supporting members inounted in opposed spaced relation on said stationary supporting means, and a plurality of heating units solocated on said supporting a plurality of heating elements seeured to said tubular supporting member, each comprising an elongated metal trough of overhung channel section, an outer bar of re- 5 fractory electric-insulating material, electric heating units mounted on the outer surface thereof, an inner bar of refractory e1eetricand heat-insulating material, both of said bars being held in proper operative positions in said trough by means integral therewith, 1

and terminal leads for said heatin units extending through said tubular heating-element-supporting member.

In testimony whereof, I have hereunto subscribed my name this 25th day of May 15 JAMES C. WOODSON. 

